DTC U2050:55 [EMERGENCY CALL UNIT (E)]

id0902sc199300

Outline

System malfunction location

Unprogrammed remote service encryption key

Detection condition

•  The emergency call unit detects that the remote service encryption key for the emergency call unit is unprogrammed.

Fail-safe

Not applicable

Possible cause

•  DTCs are stored in the body control module (BCM).

•  Inappropriate emergency call unit replacement procedure

•  Body control module (BCM) malfunction

•  Emergency call unit malfunction

System wiring diagram

Not applicable

Connector diagram

Not applicable

System malfunction location	Unprogrammed remote service encryption key
Detection condition	• The emergency call unit detects that the remote service encryption key for the emergency call unit is unprogrammed.
Fail-safe	Not applicable
Possible cause	• DTCs are stored in the body control module (BCM). • Inappropriate emergency call unit replacement procedure • Body control module (BCM) malfunction • Emergency call unit malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

INSPECT BODY CONTROL MODULE (BCM) FOR MALFUNCTION

•  Perform the DTC inspection for the body control module (BCM).
(See DTC INSPECTION.)

•  Is a DTC related to body control module (BCM) communication error or internal malfunction displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)

No

Go to the next step.

2

VERIFY EMERGENCY CALL UNIT REPLACEMENT RECORD

•  Verify if the emergency call unit has been replaced before performing this troubleshooting procedure.

•  Has the emergency call unit been replaced?

Yes

After implementing the required servicing according to procedure when replacing a module, perform the repair completion verification.

(See EMERGENCY CALL UNIT REMOVAL/INSTALLATION [(E)].)

No

Go to the next step.

3

INSPECT BODY CONTROL MODULE (BCM) FOR MALFUNCTION DEPENDING ON REPEATABILITY

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Perform the DTC inspection for the emergency call unit.
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].)

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].)

If the CAN communication is normal, replace the body control module (BCM) and perform the repair completion verification.

(See EMERGENCY CALL UNIT REMOVAL/INSTALLATION [(E)].)

No

Go to repair completion verification 2.

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Perform the DTC inspection for the emergency call unit.
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].)

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].)

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction recurs, replace the emergency call unit, then go to the next step.
(See EMERGENCY CALL UNIT REMOVAL/INSTALLATION [(E)].)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTC IS DISPLAYED

•  Perform the DTC inspection.
(See DTC INSPECTION.)

•  Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	INSPECT BODY CONTROL MODULE (BCM) FOR MALFUNCTION • Perform the DTC inspection for the body control module (BCM). (See DTC INSPECTION.) • Is a DTC related to body control module (BCM) communication error or internal malfunction displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)
1		No	Go to the next step.
2	VERIFY EMERGENCY CALL UNIT REPLACEMENT RECORD • Verify if the emergency call unit has been replaced before performing this troubleshooting procedure. • Has the emergency call unit been replaced?	Yes	After implementing the required servicing according to procedure when replacing a module, perform the repair completion verification. (See EMERGENCY CALL UNIT REMOVAL/INSTALLATION [(E)].)
2		No	Go to the next step.
3	INSPECT BODY CONTROL MODULE (BCM) FOR MALFUNCTION DEPENDING ON REPEATABILITY • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Perform the DTC inspection for the emergency call unit. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].) If the CAN communication is normal, replace the body control module (BCM) and perform the repair completion verification. (See EMERGENCY CALL UNIT REMOVAL/INSTALLATION [(E)].)
3		No	Go to repair completion verification 2.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Perform the DTC inspection for the emergency call unit. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the emergency call unit, then go to the next step. (See EMERGENCY CALL UNIT REMOVAL/INSTALLATION [(E)].)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTC IS DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.